预氯化对生物活性炭滤池运行的影响

Effect of Pre-chlorination on Biologically Activated Carbon Process

采用烧杯试验和中试两种方法研究了预氯化对活性炭吸附性能和滤池运行的影响。结果表明,氯对活性炭吸附性能会有一定影响,氯化使活性炭碘值略微降低,说明氯化会破坏活性炭的微孔结构,影响活性炭吸附小分子量物质的能力,但是氯化对活性炭内部较大孔径结构影响与活性炭种类有关;氯在活性炭滤层中沿炭层深度衰减,氯的影响深度约为40cm左右;在试验水质条件下,水中余氯会延长活性炭滤池的挂膜时间,但在生物膜发育成熟后对滤池的运行效果没有明显影响。

Effects of pre-chlorination were studied on activated carbon＇s adsorption and biologically activated filter＇s performance by jar-test and pilot-scale experiment. Chlorine had some effects on activated carbon＇s adsorption. Chlorination made iodine number lower and micro-pore destructed, which affected the adsorption of small molecular particles. But the effects on larger pore of activated carbon （AC） were related with the type of AC. Chlorine decreased along the depth of AC filter. The affected depth was about 0.4 meters. Water with chlorine made the star-up of AC filter longer. However, the performance of AC filter was affected little after the maturity of biofilm.